c1 = 0.1;
c2 = 0.2;
c3 = 0.4;
c4 = 1.0;
c5 = 0.15;
Point(1) = {0, 0, 0, c1};
Point(2) = {1.0, 0, 0, c1};
Point(3) = {0, 1.0, 0, c1};
Point(4) = {-1.0, 0, 0, c1};
Point(5) = {0, -1.0, 0, c1};
Point(6) = {1, 0, 0, c2};
Point(7) = {0, 1, 0, c2};
Point(8) = {-1, 0, 0, c2};
Point(9) = {0, -1, 0, c2};
Point(10) = {-4, 4, 0, c3};
Point(11) = {20, 4, 0, c4};
Point(12) = {20, -4, 0, c4};
Point(13) = {-4, -4, 0, c3};
Point(14) = {-0.8, 0.1, -0, c5};
Point(15) = {0.8, 0.1, -0, c5};
Point(16) = {0.8, 0.1, -0, c5};
Point(17) = {0.8, -0.1, -0, c5};
Point(18) = {-0.8, -0.1, -0, c5};
Circle(1) = {4, 1, 3};
Circle(2) = {3, 1, 2};
Circle(3) = {2, 1, 5};
Circle(4) = {5, 1, 4};
Circle(5) = {8, 1, 7};
Circle(6) = {7, 1, 6};
Circle(7) = {6, 1, 9};
Circle(8) = {9, 1, 8};
Line(9) = {14, 15};
Line(10) = {15, 17};
Line(11) = {17, 18};
Line(12) = {18, 14};
Line(13) = {10, 11};
Line(14) = {11, 12};
Line(15) = {12, 13};
Line(16) = {13, 10};
Line Loop(18) = {9, 10, 11, 12};
Plane Surface(18) = {18};
Line Loop(20) = {9, 10, 11, 12, -1, -4, -3, -2};
Plane Surface(20) = {20};
Line Loop(23) = {6, 7, 8, 5, -16, -15, -14, -13};
Plane Surface(23) = {23};
